digraph G{
  	ratio=0.75;
  	//rankdir="LR";

  	labelloc="t";
  	label="[R2] Review Notifications";

  	node[shape=box, style="rounded,filled,bold"];

  	splines=ortho;

  	nodesep=1.4;

  	"Navbar"[center=true, fillcolor="#aaaaff", style=filled,pos="0,0!"];

  	"Server"[center=true, fillcolor="#aaaaff", style=filled,pos="0,0!"];

  	"Controller"[center=true, fillcolor="#aaaaff", style=filled, shape = diamond, fixedsize=true, width=1.1, height=1.1];

  	"Notification"[shape=none];
  	"UPDATE"[shape=none];

  	"Server" -> "Notification";

  	"Notification" -> "Controller";

  	"Controller" -> "UPDATE";

  	"UPDATE" -> "Navbar";

  }